Take-up mechanism for looms



. 1,536,128 J. NORTHROP TAKE-UP MECHANISM FOR LOOMS Filed Jan. 29. 1923 3 Sheets-Sheet 1 May 5,1925. 1,536,128 J. NORTHROP TAKE-UP MECZHANJ ISM FOR LOOMS Filed Jan. 29. 1923 3 Sheets-Sheet 5 1 12 14.

I I WM/WIflM- reamed May 5, 192a new an e n L a onas non'rnnor; or HGETEIJALE;MASSACHUSETTS, Assmnos 'r'o" HOPEDALEQIM'AN-UQ micron-IneooniPanY; OF MILFORID, MnssnoHUsET'rsyA COR-PORAT'IONOF Messeonnsn'rrs.

TAKE-UP mnonterirsia ron Looms.

Application filed January 29, 19523. SerialNo. 615,518?

To (tilde/ 20m 2'1? may concern:

Be itlrnown that T, Jones Nomrmor; a citizen of the United States, residing at .llopedale, in the county of Worcester and State of Massachusetts, have 1nvente lcertain new and useful Improvements in Take U p Mechanisms for Looms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whlch it appertains to make and use the" same.

The present lnvention relates to looms and more particularly to take-up mech'anisn'is for looms.

The usual types of looms include a take up mechanism together with a let-back mechanism which adapted to let the cloth' back a certain number of p cks after detection of absence of filling. Prior types of let back mechanisms usually employed a ratchet device maintained 1n constant en adjustment of the ratchet or pawl. This let-back of the cloth took place merely 'because of the tension upon the cloth. It will be ap 'neciated that this mechanism is open to the objection that its action is not positive and that the engagementof thefiratchet device with the toothed wheel imposes a constant and detrimental wear upon the ap paratus. The obyect of the present 1nven-" tion is to provide a looin haying a let-back mechanism whlch will positively control the movement of the cloth after absence of fill-' mally maintained out ofengagementwith the take-up mechanism and in wliiich the letback acts positively to determined distance. 71th these and other objects in View, the present lllVQntlOn consists ofthe loom hereinafter described and particularly defined in the claims.

In the accompanying drawings Fig. 1 is an elevation of a portion of a loom showing the improved take-up and let-back mecha nisms in normal operating Condition; Fig. 2 is an elevation ofthe apparatus shown in and Fig. 6 a detail shoi'ving the connec- Another object of'the invention is to provide a loom m which the let-back 1s normovethe cloth a pre'- the slide 50 tang-asset wound up'bn'a wind-up" roll 12 yieldingly maintz'iiired 'again'st'a draw roll 13 so as to i be l'ricti'onally driveni thereby: The draw roll itself is positii e'ly rotated by means of" the gear train 14, 1G, 18' and 201 The gear 20 is known asthe change gear and *is adjustably mounted I in a slotted bracket 22L Thenuniberof teeth in"thegear "20 bears a fixed relationto the grade of'clotliyand'the size of the gear used will depend npon the' number of picks the weft per inch in the wovenfabrici The gear 20 meshes with a worm 2% mounted uponfa shaftQG which is rotated by any suitable earing [connected with the cam shaft. Undernornial 'rinining'; conditions, the gear 2O= rot ates ina-clocli wise direction;

The worm 24 is adapted to be moved nae and out of ejngagen'ient"witlrthe gear 20 through the action of a sliding bracketFQS which is provided with a lw'afrin 30 in which shaft 26 "is onrnaled'x" The bracket 28' is provided'with slots 32Iand 34in whicl'i are received studs 30 an d 38 securel to any suitable stationary part of theloo'iti. The stud" 38 has mounted thereon a cahi 40 which is connected "with a can'r arnr 42 and i which'is adapted'to bea'r against 'an-"upper against the lugs" and 'raise orlo'wer the bracket at the same time-carrying; the worm Z4L'1nto or out of engagenientavlththe gear 20. Thecam is preferably provided" with bearing surfaces of such'forn'i as toengage the lugs '44 and a6 anchlocldthebracket-in eitl'lerpositionl The "oscillations of the cam '40 are controlled bythe movement of the weft ha1nmer 4S and the detector slide 50 when the filling;- is absent. Tlreweft hammer is osciltion from a wefthainmer lever of the nsual type (not shown). On its forward motion, let er which actn' ates the change lever 54: which is in turn connected with the cam arm 42 by a link 56, this latter link being; pivoted to the cam arm by a stud 58. This motion rotates the cam in a counterc-loehwise direction and 'lOU yaw

lowers the worm from engagement with the gear 20. The foregoing details of construction are substantially as described in Northrop Patent No. 1,479,154.

The let-back mechanism includes an engagement dog mounted upon a stud 62 which is adjustably secured in the slot 64 of a bracket 66 secured to the frame of the loom. The dog is provided with a handle 68. A. segmental gear member 70 is pivoted at 72 upon the upper surface. of the dog and is provided with an integral stop member 74 adapted to hold the gear upon the dog in the manner shown in Fig. 5. When the dog is in the position shown in Fig. 5, the gear teeth are preferably disposed along a circular arc concentric with the stud 62. The motion of the dog is limited by an ad justable screw member 76 which is adapted to strike a surface 78 of the bracket (36. The dog is yieldingly connected with the cam arm 42 through a link 80 connected at one end on a stud 82 of the dog and received at the other end in the threaded collar 84 upon which is wound a helical spring 86 secured at its other end to the stud 58. The link 80 is bent in a manner to provide a passage or slot 81 in which the Stud 82 is received. The tension of the spring 86 may be adjusted by varying the relative positions of the link 80 and the collar 84. The spring is preterably so adjusted that when the parts are in the position indicated in Fig. 1, no tension is upon the spring, but upon the movement of the arm 42, the spring will immediately be put under tension and draw the dog so that the segmental gear engages with the change gear 20.

It will be seen that upon the forward motion of the slide 50, the parts will assume the positions as shown in Fig. 2, the cam being actuated to lower the bracket 28 and disengage the worm from the gear 20, the dog being at the same time moved into engagement with the gear 20, the amount of the movement depending upon the adjustment of the screw 76. The various parts are so relatively disposed that the segmental gear 70 comes into engagement with gear 20 before the worm 24 drops out of engagement, otherwise the tension on the cloth would rotate the gear 20 too :Far in a counter-clockwise direction. The flexible connection between the dog and the arm allows this action to take place without shock or danger of breaking any of the gear teeth. Upon engagement of the gear 70 with the change gear 20, the cloth is positively let back a certain definite amount, depending upon the p 1,5ss,12s

motion of the dog before the screw 76 strikes the surface 78 of the bracket. Upon motion or the lever 54 to the position shown in Fig. l, the worm is again brought into engagement with the change gear and upon continued rotation of the worm, the change gear is rotated in a clockwise direction, thereby throwing off the dog (30 into the position shown in Fig. 1. Due to the provision of the slot 81 in the link 80, the dog itself .it not thrown oil by the return motion of the arm 42, because it such were the case, the dog might be thrown out of engagement before re-engagement of the worm with the gear, thereby taking the gear outof positive control.

Provision is made for allowing the operative to rotate the wind-up mechanism by hand if desired. To this end, the dog is provided with a member 88 having a slot 90 by which the member 88 may be adjustably secured to the dog through a bolt 92, as indicated in Fig. 3. The member 88 is provided at its lower end with a hunter 94 adapted to strike the lower end of the lever when the handle 68 is pulled outwardly. When this is done, it will be seen that the worm 24 is dropped out of engagement with the gear, while at the same time the segmental gear 70 is also maintained out of engagement with the change gear. The opcrative may then take up or let back the cloth by hand in any desired manner but it is preferred to use a hand wheel construction of the type described in the Northrop Patent No. 1,446,655.

The advantages of the improved take-up mechanism of the present invention are (1) that the wear ordinarily attendant upon the constant engagement of the let-back mechanism is eliminated; (2) that the cloth is positively moved a predetermined distance by the action of the let-back; and provision is made for a convenient winding of the cloth by hand whenever the operative so desires.

I claim:

A loom having, in combination, a take-up mechanism, means for driving the take-up mechanism, a change lever, connections between the change lever and the driving means to disengage the driving means from the take-up mechanism, a. let-back device norn'ially maintained. out of engagement with the take-up mechanism, and a bunter mounted upon the let-back device and adapted to move the change lever upon manual movement oi the let-back device.

JONA S NORZHROP. 

